Whats the best chemicals to use when powerwashing a driveway?

17 Answers

Depending on the drainage I've always used a pump sprayer with a 50/50 solution of bleach and water. Spray down the driveway with the bleach/water let stand for 20 minutes then wash it off with the pressure washer. It kills all the green molds growing and makes the concrete look good as new

Source(s): Remodeling old houses since I was 10. Best carpenters around to teach me old school tricks!

Normally the advantage of a power washer is that no chemicals are normally needed. Also remember that chemicals will kill any grass or plants that come into contact with water with harsh chemicals. Also remember that a strong power washer can scar the surface of concrete.